Its an aluminum Hurst shifter, upside down. Uses the sled pull-starter recess which looks like it was meant to be. Hooked to a shaft that crosses the bulkhead to engage the LH side shifter on the HD motor. Shifting is slow, you've got to drop your throttle hand but it works fine. The way sleds slow down, you have to wrap the old gear more than a street bike to compensate for the extra slowing of the sled so the new gear is engaged at the desired rpm. Do it again; I'd use a big twin without the tranny, HD primary belt drive to a jackshaft carrying the primary sled clutch. That way you can gear the jackshaft up to sled-motor rpms. Still have to tune the primary clutch for earlier engagement to take advantage of the big twin power-band. Yes, yes, still going to be heavy and slow but this is about noise, chrome and smiles. We'll leave the rocket-sledding to the indestructible...